import java.util.ArrayList;
import java.util.List;

public class YangHui {

    public static class Solution {
        public List<List<Integer>> generate(int numRows) {
            List<List<Integer>> list = new ArrayList<>();
            List<Integer> list1=new ArrayList<>();
            list1.add(1);
            list.add(list1);
            list1.add(3);
            return list;
        }
    }

    public static void main(String[] args) {
        Solution solution = new Solution();
        List<List<Integer>> result = solution.generate(5);
        for (List<Integer> row : result) {
            System.out.println(row);
        }
    }
}
